Most of us aren't saying that they're doing nothing. What we're saying is that what they're doing isn't stopping the spam. Because it isn't. Botting and gil selling is going to keep happening, I think most of us just want the being bothered to stop.
I think that's part of it. They do send /tells on JP servers, but only in text swapped English to defeat the filters and it's much much more rare. I suspect that it isn't as lucrative to advertise that way which is exactly where I wish we could get on NA/EU servers. In other conversations about this, it's been made perfectly clear to people that players on JP servers buy gold. It's just marketed differently.